<!DOCTYPE html>
<!-- approach 2: itemref to id= property
From: https://stackoverflow.com/questions/6535779/using-itemprop-branchof-from-schema-org-microdata-to-refer-to-localbusinesss
Result:
* Two LocalBusiness items with blank branchof properties.
* One Organization
-->
<html><head><title>Title</title></head><body>
<div id="about" itemscope itemtype="http://schema.org/Organization">
  <meta itemprop="url" content="http://example.org"/>
  <meta itemprop="name" content="Organization X"/>
</div>
<div id="contact">
  <div id="branch_a" itemscope itemtype="http://schema.org/LocalBusiness">
    <meta itemprop="name" content="Organization X Branch A"/>
    <meta itemprop="branchOf" itemscope itemref="about"/>
  </div>
  <div id="branch_b" itemscope itemtype="http://schema.org/LocalBusiness">
    <meta itemprop="name" content="Organization X Branch B"/>
    <!-- approach 2: redefine "Organization X"? -->
    <meta itemprop="branchOf" itemscope itemref="about"/>
  </div>
</div>
</body></html>
